Use this simple apparatus to measure relative humidity. Includes two plastic-backed Celsius thermometers, one for dry bulb measurements and the other for wet bulb measurements. The thermometers mount on a wooden handle so they can be spun to obtain tem

Sling-Type Psychrometer for Relative Humidity Measurement Compact One-Piece, High Impact Plastic Construction Scale Range on One Side for Easier, and More Accurate Results Slide-Rule Calculator Gives Direct Readings without Reference to Outside Tables One Piece Wick and Water Well…